indulgence vs splurge

indulgence and splurge both are nouns.

Word	Noun	Adjective	Verb	Adverb
indulgence	Yes	No	No	No
splurge	Yes	No	Yes	No

As nouns, splurge is a hyponym of indulgence; that is, splurge is a word with a more specific, narrower meaning than indulgence:

Other hyponyms of indulgence include intemperance, intemperateness, self-indulgence, excess, overindulgence, binge, orgy.

indulgence (noun)	splurge (noun)
the act of indulging or gratifying a desire	any act of immoderate indulgence
foolish or senseless behavior	an ostentatious display (of effort or extravagance etc.)
the remission by the pope of the temporal punishment in purgatory that is still due for sins even after absolution
an inability to resist the gratification of whims and desires
a disposition to yield to the wishes of someone

indulgence (verb)	splurge (verb)
	be showy or ostentatious
	indulge oneself